SDET interview questions: API cookies, CI/CD, Selenium, SQL, RestAssured

Challenging interview question I faced during my last few interviews for SDET 3 & 4 positions 1) Is it possible to integrate API generated cookies directly with Selenium WebDriver tests? If yes how? 2) How do you make sure 3rd party APIs like payment gateways are integrated for Test Automation Framework? 3) Do you prefer to automate it using UI or API and Why? 4) Why did Amazon moved back to Monolithic architecture? Can you justify? 5) When should use LomBok for POJO classes instead of Builder Pattern? 6) How do you manage a CI/CD pipeline when high-priority scenarios fail during execution? 7) Write the code snippet for passing values 1 and 2 to the parameters val1 and val2 through the XML file. 8) If you are using Selenium WebDriver, How do you create a Test Automation Framework for a page having 700 unique webelements? 9) How to keep API Tests idempotent? 10) What happens when you write "new ChromeDriver();"? 11) Wrote a SQL Query using 3 Inner Joins (Data was given by the interviewer) 12) Explain the use and implementation of Response & Request Spec in RestAssured? Also tell me why we need to create a Abstraction layer? 13) How can you resolve, Element Click Intercepted Exception? 14) What are different ways to manage Dynamic WebElements? Note: Refer Java Arrays Cheatsheet below! -x-x- If you need answers then can be found here with 1050+ Q&A Bank for SDETs + SDET Coding Interview Prep: https://lnkd.in/gFvrJVyU Become Full Stack Test Automation Engg - Architect: https://lnkd.in/dWjpT3-3 #japneetsachdeva

🚀 Crack QA Interviews: Mastering Abstraction in OOPs & Selenium 💡 If you’re preparing for QA / SDET interviews, one of the most common Core Java + Selenium questions is: 👉 “What is Abstraction? Where do we use it in Selenium Automation? Why is it important?” Let’s break it down 👇 🔹 What is Abstraction? • Abstraction means hiding implementation details and showing only essential functionalities. • It allows us to focus on what an object does, not how it does it. • In Java, abstraction is achieved using abstract classes and interfaces. ✅ Simple Example (Real life): When you drive a car 🚗, you just press the brake pedal. You don’t need to know the internal hydraulic mechanism. ✅ Code Example (Java): WebDriver driver = new ChromeDriver(); driver.get("https://google.com"); Here, WebDriver is an interface (abstract) and ChromeDriver is the implementation. 🔹 Where do we use Abstraction in Selenium Automation? 1. WebDriver Interface → Hides browser-specific implementations (Chrome, Firefox, Edge). 2. BasePage Class → Abstracts common actions (clickElement(), enterText(), waitForElement()). 3. BaseTest Class → Abstracts test setup & teardown (browser launch, quit, reporting). This ensures we write once, use everywhere – making the framework scalable, maintainable & clean. 🔹 Why is Abstraction Important? • Improves code reusability and readability. • Makes framework maintainable – changes in one place reflect everywhere. • Increases interview confidence because it shows you know both Java OOPs + Selenium design. 🔹 How to Explain in an Interview? “Abstraction means hiding implementation details and exposing only required functionalities. In Selenium, we use abstraction via the WebDriver interface and in framework design using abstract BasePage or BaseTest classes. This helps us build a reusable, scalable, and maintainable automation framework.” 🔑 Final Takeaway If you explain Abstraction with both Java concept + Selenium usage + Framework example, you’ll stand out in QA interviews. #SDET #TestAutomation #QATesting #Java #OOPsConcepts #Selenium #AutomationTesting #TestEngineer #InterviewPreparation #CodingForTesters #CareerGrowth

🚀 Crack QA Interviews: Mastering Abstraction in OOPs & Selenium 💡 If you’re preparing for QA / SDET interviews, one of the most common Core Java + Selenium questions is: 👉 “What is Abstraction? Where do we use it in Selenium Automation? Why is it important?” Let’s break it down 👇 🔹 What is Abstraction? • Abstraction means hiding implementation details and showing only essential functionalities. • It allows us to focus on what an object does, not how it does it. • In Java, abstraction is achieved using abstract classes and interfaces. ✅ Simple Example (Real life): When you drive a car 🚗, you just press the brake pedal. You don’t need to know the internal hydraulic mechanism. ✅ Code Example (Java): WebDriver driver = new ChromeDriver(); driver.get("https://google.com"); Here, WebDriver is an interface (abstract) and ChromeDriver is the implementation. 🔹 Where do we use Abstraction in Selenium Automation? 1. WebDriver Interface → Hides browser-specific implementations (Chrome, Firefox, Edge). 2. BasePage Class → Abstracts common actions (clickElement(), enterText(), waitForElement()). 3. BaseTest Class → Abstracts test setup & teardown (browser launch, quit, reporting). This ensures we write once, use everywhere – making the framework scalable, maintainable & clean. 🔹 Why is Abstraction Important? • Improves code reusability and readability. • Makes framework maintainable – changes in one place reflect everywhere. • Increases interview confidence because it shows you know both Java OOPs + Selenium design. 🔹 How to Explain in an Interview? “Abstraction means hiding implementation details and exposing only required functionalities. In Selenium, we use abstraction via the WebDriver interface and in framework design using abstract BasePage or BaseTest classes. This helps us build a reusable, scalable, and maintainable automation framework.” 🔑 Final Takeaway If you explain Abstraction with both Java concept + Selenium usage + Framework example, you’ll stand out in QA interviews. #SDET #TestAutomation #QATesting #Java #OOPsConcepts #Selenium #AutomationTesting #TestEngineer #InterviewPreparation #CodingForTesters #CareerGrowth

Day 2 – QA/SDET Interview Question Series (1–3 Yrs Experience) 🧩 Framework Level 1. What is the difference between TestNG @BeforeMethod and @BeforeClass? 2. How do you handle API authentication (e.g., OAuth2) in an automation framework? 3. Why do we use Page Object Model (POM), and how does it help in framework scalability? 💻 Coding 1. Write a Java program to reverse a string without using built-in functions. 2. Find the second largest number in an array. 3. Explain the difference between == and .equals() in Java with an example. 👥 Managerial / Behavioral 1. Tell me about a time when you found a critical bug just before release. How did you handle it? 2. How do you prioritize test cases when timelines are tight? 3. How would you explain the importance of quality to a non-technical stakeholder? ✨ Tip for Candidates: Consistency and clarity in explaining concepts matter more than rushing to answers. Think aloud during coding rounds—it shows your approach. #QA #SDET #InterviewPreparation #TestingCareers #AutomationTesting #TestAutomation #JavaCoding #FrameworkDesign #QualityEngineering

🔥 Most people prepare for SDET interviews with theory… but interviews test your real-world problem-solving. That’s why I’ve compiled 60+ practical coding & automation scenarios you’ll actually face in QA/SDET interviews. 🚀 📌 What’s inside? ✅ Java & Data Structures (25 problems) – Strings, arrays, recursion, collections, sorting, palindrome, longest substring, balanced brackets & more. ✅ Selenium with Java (20 tasks) – Login flows, dropdowns, file upload/download, custom retries, stale element handling, Excel-driven tests. ✅ API Testing with RestAssured (20 scenarios) – Token chaining, schema validation, JSONPath assertions, negative cases, file upload, retries, reusable methods. 👨💻 Perfect for: QA Automation Engineers SDET Aspirants Manual Testers moving to Automation Anyone preparing for tough project-based interviews ⚡ Pro Tip: Don’t just read these problems — solve them, debug them, and explain them like you would in a real interview. 👉 Want the full PDF guide with 60+ scenarios? Comment “SDET” and I’ll share it with you directly. #SDET #QAAutomation #TestAutomation #Selenium #RestAssured #Java #APITesting #ManualToAutomation #SoftwareTesting #InterviewPreparation #QACommunity #CodingForTesters #CareerGrowth

💡 Top Core Java + Selenium Automation Interview Questions to Prepare for in 2025 💡 As the demand for skilled Automation Test Engineers keeps rising, interviewers are focusing on real-time problem solving and hands-on coding skills more than ever. Here are some must-prepare topics & questions for your next big interview: --- ⚡ Core Java Questions: 1️⃣ Explain OOPS concepts and how you use them in automation frameworks. 2️⃣ Difference between Interface and Abstract Class—when to use which? 3️⃣ What is a Singleton Class and how is it used in a Selenium framework? 4️⃣ Java Collections (List, Set, Map) – real-time use cases in test automation. 5️⃣ Handling Exceptions and using try-catch-finally in automation scripts. 6️⃣ Explain Thread Safety and how it affects parallel test execution. 7️⃣ What is Java Streams API and how can it simplify test data handling? --- ⚡ Selenium Automation Questions: 1️⃣ Difference between findElement and findElements. 2️⃣ How to handle dynamic web elements (changing IDs, XPaths). 3️⃣ Ways to implement Explicit Wait vs Fluent Wait. 4️⃣ Explain Page Object Model (POM) and Page Factory. 5️⃣ Handling Alerts, Frames, and Windows in Selenium. 6️⃣ How to capture screenshots on failure in a framework. 7️⃣ Integration with TestNG/JUnit & CI/CD tools like Jenkins. 8️⃣ How to achieve parallel execution using Selenium Grid or Docker. --- 🔥 Pro Tip for 2025 Interviews: 💡 Expect practical coding tasks—like writing a reusable method to handle dynamic dropdowns or implementing a wait strategy without Thread.sleep(). 💡 Strong Core Java skills + knowledge of design patterns (Singleton, Factory, Builder) = 🔑 to stand out! 📢 Are you preparing for a Selenium Automation interview this year? Which question do you find most challenging? Comment below 👇 #AutomationTesting #Selenium #CoreJava #QA #InterviewQuestions #TestingCareers #Java2025

🚀 Crack Your SDET Interview with These Must-Know Java Programs! Are you preparing for an SDET (Software Development Engineer in Test) interview? 🔍 Mastering Java is just one part — you also need to think like a tester and code like a developer. Here are some top Java programs you must practice: ✅ Reverse a string (with and without StringBuilder) ✅ Palindrome checker ✅ Find duplicate elements in an array or string ✅ Count vowels and consonants in a string ✅ Sort an array without using built-in methods ✅ File reading/writing in Java ✅ API automation using RestAssured ✅ Selenium WebDriver with TestNG/JUnit basics ✅ Java 8 Stream API for filtering test data ✅ Handling Exceptions in Test Automation 💡 Pro Tip: Focus on clean, readable, and testable code! 📌 Bookmark this list and start preparing now. 📤 Share with someone preparing for SDET roles. Fallow My LinkedIn Account Abhay Tripathi #SDET #Java #CodingInterview #AutomationTesting #TechJobs #TestAutomation #LinkedInLearning #CareerTips #JavaInterview #SDETInterview #InterviewPreparation

🚀 Crack Your SDET Interview with These Must-Know Java Programs! Are you preparing for an SDET (Software Development Engineer in Test) interview? 🔍 Mastering Java is just one part — you also need to think like a tester and code like a developer. Here are some top Java programs you must practice: ✅ Reverse a string (with and without StringBuilder) ✅ Palindrome checker ✅ Find duplicate elements in an array or string ✅ Count vowels and consonants in a string ✅ Sort an array without using built-in methods ✅ File reading/writing in Java ✅ API automation using RestAssured ✅ Selenium WebDriver with TestNG/JUnit basics ✅ Java 8 Stream API for filtering test data ✅ Handling Exceptions in Test Automation 💡 Pro Tip: Focus on clean, readable, and testable code! 📌 Bookmark this list and start preparing now. 📤 Share with someone preparing for SDET roles. Fallow My LinkedIn Account Abhay Tripathi #SDET #Java #CodingInterview #AutomationTesting #TechJobs #TestAutomation #LinkedInLearning #CareerTips #JavaInterview #SDETInterview #InterviewPreparation

Preparing for a Sr. QA Engineer Interview? here some hot questions 🔹 Round 1: Technical (10 Qs) 1- Introduce yourself & responsibilities. 2- Java: Reverse a string while keeping spaces intact. 3- SQL: Find the 2nd highest salary. 4- Types of SQL Joins. 5- LinkedHashMap & its use case. 6- Black-box vs White-box testing. 7- Exception vs Error in Java/python. 8- Implicit vs Explicit waits in Selenium. 9- Smoke vs Sanity testing. 10- Biggest project challenges faced. 🔹 Round 2: Techno-Managerial (10 Qs) 1- Explain your automation framework. 2- Handling “Element click intercepted” exception. 3- Capture failed test screenshots in TestNG. 4- Why use Cucumber BDD? 5- Static vs Dynamic binding. 6- Comparable vs Comparator. 7- Key points of a good test case. 8- Explain TestNG . 9- Can captchas be automated? 10- Purpose of CRON in Jenkins. 🔖 #SrQAInterview #TestAutomation #Selenium #Java #SQL #JMeter #Cucumber #TestNG #QualityAssurance #QATesting

Day 3 – Interview Question Series QA/SDET (1–3 Yrs Mid-Level) 🧩 Framework Level 1. How do you design a reusable utility class in your framework? 2. Explain the concept of Data Providers in TestNG. How do they help in test efficiency? 3. What is the role of a Logger (like Log4j) in automation frameworks? 💻 Coding 1. Write a Java program to check if a number is prime. 2. Given a string, count the number of vowels and consonants. 3. How would you detect and remove duplicates from an array? 👥 Managerial / Behavioral 1. How do you handle a situation where requirements keep changing during a sprint? 2. Tell me about a time when your automation scripts failed in CI/CD pipeline. How did you resolve it? 3. How do you balance between automation coverage and delivery timelines? --- ✨ Tip for Candidates: At mid-level, interviewers focus on scalability of your solutions and practical ownership of real-world issues. Highlight problem-solving, not just theory. #QA #SDET #InterviewPreparation #AutomationTesting #JavaCoding #FrameworkDesign #QualityEngineering #TestAutomation